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The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for the test.
hours
score
5
64
10
86
4
69
6
59
9
87
a. -0.678
b. 0.678
c. 0.224
d. -0.224
e. 0.157
Do students tend to improve their SAT Mathematics (SAT-M) score the second time they take the test? A random sample of four students who took the test twice received the following scores
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